Honestly if you want to see what happen if you just tune up all the damage to a stratospheric degree, the most recent example is in Occult Crescent. Specifically speaking: the gold farming parties. The AA damage per mob are so high it will one shot any non-tanks while tanks themselves can only take 2-3 of them raw before warming the floor. If they're solo pulling for the party, sure... but anything beyond that, you're back to spamming 1 button - your GCD healings. Even then, what we end up doing instead is to either kite or to invuln against multiple of mobs at the same time, both of which completely eliminates the need for GCD healing half of the times. Worse, what we do instead is to sub in Cannon to join the bombarding instead of... full time healing... lol.

I don't think that's the kind of healing situations everybody would like to have at every given moment.